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3 Attachment(s) Long Tail Phase Splitter by John L Stewart
In a previous post John Byrnes asked why I used a resister rather than an MJE340 for the long tail in a phase splitter. The short answer is that it works &...
March 16th 13 11:03 PM
by John L Stewart Go to last post
5 1,342
A Stupid Idea by Bret L
The latest AudioXPress has on its cover a stereo amplifier using one 4D32 tetrode in Class AB2 per channel as an output device. Why do people persist in acts...
(Multi-page thread 1 2 3 ... Last Page)
March 13th 13 05:53 PM
by The real GARY Go to last post
32 4,779
HT Stabilizer by Servo Kon
We offer the range of HT Stabilizer, HT inbuilt Stabilizer manufactured in compliance with international quality standards using high grade raw material. For...
March 13th 13 12:30 PM
by Servo Kon Go to last post
0 849
Boosted cathode follower, super cathode follower etc by patrick-turner
Recently we heard about Mr Pogossov's "boosted cathode follower" using a bjt between the cathode and 0V rail where the bjt has base current from an anode R...
March 4th 13 10:25 AM
by patrick-turner Go to last post
2 1,841
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1 Attachment(s) Replying to a Private Message by John L Stewart
Need some help here. How does one reply? All I can see is Forward, Delete & some other stuff but nowhere can I see how to reply. Thanx for help, Cheers to...
March 1st 13 07:23 AM
by patrick-turner Go to last post
1 913
FS: NOS KenRad 6SN7 -GT (Smoke Glass Pairs/Quads) VT-231s by [email protected]
On Sunday, August 22, 1999 3:00:00 AM UTC-4, Lets-Make-a-Deal wrote: > I have several beautifully mint NOS-IOB (In original Box) smoke glass KenRad > 6SN7s...
February 28th 13 06:17 PM
by Muck Krieger Go to last post
1 808
QUAD I amplifiers by Simon Whiting
Hi all, I don't know much about valve amplifiers, and I hope that your members might be able with some advice. I've got a couple of QUAD I* amplifiers, but one...
February 28th 13 09:56 AM
by patrick-turner Go to last post
1 1,007
valveradio.net by patrick-turner
On Sunday, 24 February 2013 23:19:59 UTC+11, Alex Pogossov wrote: > On the dusk of my days I decided to follow an example of some folks and launched my...
February 28th 13 09:24 AM
by patrick-turner Go to last post
2 999
6SN7GT PREAMP TUBES by Haywood Yastoppit
Here are some 6SN7GT dual triode tubes for sale on eBay. Various brands. Mostly used, but good older, tested, USA-made tubes. RCA, General Electric, Arcturus,...
February 11th 13 04:12 AM
by Haywood Yastoppit Go to last post
0 801
favourable triode section by GRe
http://www.mif.pg.gda.pl/homepages/frank/sheets/010/e/ECC82.pdf With reference to the Remark on page-1 of the above datasheet, does anybody know the...
February 10th 13 11:49 AM
by jh[_3_] Go to last post
8 1,160
I'm looking for a Boob Tube by [email protected]
For years I've heard about the Boob Tube. Yet, I've never been able to find one. I want to find a real tube that has boobs on it. Anyone know where to find...
February 9th 13 03:21 AM
by [email protected] Go to last post
0 727
All the best in 2012A. by [email protected]
On Tue, 1 Jan 2013 00:11:38 -0800 (PST), patrick-turner > wrote: >2013 is an unfortunate year number. Remember 1913? - a...
February 3rd 13 02:52 AM
by patrick-turner Go to last post
1 760
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1 Attachment(s) 500-2500 volt, 200-250 ma CV PS by John L Stewart
Here ya are Patrick, a constant voltage PS that can be varied over a range of 500 to 2500 volts. I will leave it to you to come up with an amplifier suitable...
January 29th 13 01:39 AM
by John L Stewart Go to last post
0 721
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1 Attachment(s) 1600 volt 250 ma Constant Current PS by John L Stewart
This one was built in the 60's. It has both +ve & -ve rails for the error amp. Stability depends on the 85A2 gas regulator & the current sampling resister. Not...
January 24th 13 02:29 PM
by patrick-turner Go to last post
1 886
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1 Attachment(s) Brute Force 2.5 KV, 0.5 Amp CC PD Drives a Laser by John L Stewart
The Schema for this on was much faded, so it is redone here. A 2.5 KV, 0.5 Amp Constant Current Power Supply This power supply was used to drive a He-Ne...
January 22nd 13 06:31 PM
by John L Stewart Go to last post
0 762
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2 Attachment(s) Hybrid Reg PS by John L Stewart
Here is just one of many possible hookups. It uses 4x6BX7GT to get 50 Watts of dissipation for the main losser. An IFR 840 n-Fet controls the grids, the combo...
January 21st 13 05:23 PM
by John L Stewart Go to last post
1 761
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4 Attachment(s) What is it? by John L Stewart
What is it?
(Multi-page thread 1 2)
January 21st 13 09:48 AM
by Phil Allison[_3_] Go to last post
16 1,877
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4 Attachment(s) Simple Regulated PS Using 6N7 Pass Tubes by John L Stewart
In this one the 6N7s need to be driven into grid current to get anykind of useable output current. But the stabilization factor is porportional to the pass...
January 21st 13 03:00 AM
by John L Stewart Go to last post
6 2,943
FS: Set of 6GM5 pentodes ( neonoval based 7591A ) by overreactor
I need to raise some quick cash, so I'm selling off my collection of 6GM5 audio power pentode tubes from my repair parts stock. This tube is electrically...
January 18th 13 09:24 PM
by heavyP Go to last post
1 1,441
Apparently This Matters: Ruzzle by Valentine
Apparently This Matters: Ruzzle http://adf.ly/2836760/rss.cnn.com/~r/rss/edition_technology/~3/cJ5l4WYWCXw/index.html
January 7th 13 02:58 PM
by Valentine Go to last post
0 973
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